Consider the following scenario:
- You use a laptop that is running Windows 7, Windows 8, Windows 8.1, or Windows 10.
- The laptop has an external LCD monitor attached.
- You press Windows logo key+P to switch to the "Duplicate" or "Extend" display mode.
- You press Windows logo key+P again, and then you make the following selection:
- In Windows 8, Windows 8.1, or Windows 10: Second screen only
- In Windows 7: Projector only
- You close and then reopen the laptop lid.
In this scenario, the display mode reverts to the "Duplicate" or "Extend," depending on which was selected before you changed to "Second screen only" or "Projector only."
This behavior is by design. When you close and then reopen the lid on a laptop, the Connecting and Configuring Displays (CCD) feature in Windows automatically reverts the display mode to the last active selection.
To restore the display mode that you want after you close and reopen the laptop lid, press Windows logo key+P again, and then reselect "Second screen only" or "Projector only" mode.